[MIKE TYSON]

THANKS!

[hytong]

The short answer is all times. Just keep the hood on.
1. It prevents excesive stray light from entering the lens, causing lens flare => lower contrast => lower image quality.
2. It protectes the front element (to an extent)

[MIKE TYSON]

thanks~

[tigerz]

很多人覺得有型,所以all time...

[bensonpo]

其實如果頭頂有光射下來,
在此情況下會有部份由上面o既光影響到鏡頭曝光,
影出o既o野會多o左o的一噠噠o既光係相片上,
尤其係夜晚曝光,頭頂有強燈會明顯一點,
日光頭頂晒都會,
係咁情況遮光罩就有用o勒!